The advert stars with Liam on Ireland's streets in the build up to a big fight. Throughout the clip, shots of McGregor filter through, showing the resemblance.

Liam prowls the ring (Image: Beats by Dre/Youtube)

McGregor moves in the same way (Image: Beats by Dre/Youtube)

Notorious B.I.G.’s 'Juicy' plays throughout the advert.

The 29-year-old, who is set to face undefeated former welterweight champion Floyd Mayweather in a £500million Las Vegas superfight on August 26, began his career in Crumlin Boxing Club in Dublin.

Wrap up tight! (Image: Beats by Dre/Youtube)

McGregor's custom pair of Beats (Image: Beats by Dre/Youtube)

Back then, McGregor went by a different nickname - Snowball. At 10 years old the Irishman used to have an unrecognisable white-blond bowl haircut.

Retired head coach Phil Sutcliffe recalls: "Conor came in wearing muddy football boots, so we gave him a right telling off.

McGregor, his son and partner Dee (Image: Zuffa LLC)

A young Conor McGregor (Image: Internet Unlnown)

"He asked to join and we told him to get some forms from the office for his parents, who were outside. Instead of doing that, he started punching a bag. He still hadn’t taken off the boots so we roared at him.

"That was the Friday. He came back on the Saturday and almost every day for the next seven years."

His dedication and rise to the top earned him a new nickname - The Notorious.